Evangelion: Tieing into its name, Leliel is a shadow. It's easy to assume that the giant, zebra-striped sphere is the Angel, but that is actually an illusion that is produced as a distraction. The Angel is the shadow beneath, which is shown here, consuming buildings. The NERV scientists dub this shadow a "Dirac Sea" which comes from the man, Dirac, who invented quantam phsyics. The Dirac sea was created to explain some of his odder equation results, and is basically a space full of negative electrons. Negative energy means negative mass, which in theory creates antigravity (then you look back up to the giant ball floating in the sky).